Thermographic apparatus for copying images



Nov. 17, 1964 w. LIMBERGER 3,157,786

THERMOGRAPHIC APPARATUS FOR COPING IMAGES Filed April 17, 1962 2Sheets-Sheet 2 INVENI'OP 3,157,786 Patented Nov. 17, 1964 3,157,736THERMOGRAPHEC APRARATUS FOR COPYING GES Walter Limberger,Hamburg-Poppenhuttel, Germany, as-

signor t Lumoprint Zindier KG., Hamburg, Germany Filed Apr. 17, 1962,Ser. No. 188,618 Claims priority, applicationsglsermany, Apr. 29, 1961,

5 Claims. (a. 250-65) This invention relates to a method for dry copyingimages from an original on a copy sheet, and a device for performingthis method in which a source of radiation is employed for producing .alocally defined heating.

These known methods and devices require the use of specially composedmaterials with additives which, during the copying process performed byexerting a pressure upon said original, will effect a decelerationaccording to the local heating zones. This method is disadvantageous inthat special material is required, the characteristics of which beingdetermined by the additives. Besides this such materials are expensiveand do not allow second copies to be made.

According to one embodiment the invention starts out from employing in aknown manner per se a powdered dyestuif. Such powdered dyestuffs havepriorly been used in xerography. According to this method anelectrostatic charge dissipation corresponding to the original is produced within a special layer, the electrostatic forces of which exertinga selective force of attraction upon said powder. In this known methodit is necessary to fix the powder maintained by the electrostatic forcesin a separate annealing device.

This method is disadvantageous because a specially prepared layer mustbe used for producing the electrostatic latent image, and because aseparate additional source of heat must be provided for fixing thepowder image. In addition it should be noted that the powdered dyestuffcomprises special particles in this known method, for example resinousparticles which are being attracted selectively by the electrostaticforces of the latent image, and that particular difficulties arise,because these particles must be distributed evenly over theelectrostatic latent picture, and patricles which are not effected bythe attractive force must be removed without influencing the arrangementof the other particles.

The main object of this invention is to provide a method for dry copyingimages from an original, in which a normal sheet of paper may be usedfor making the copy, and in which in addition the production of theimage is accomplished without special measures for shaking-off adeveloping powder from the paper sheet.

Another object of the invention is to provide a device for performingthe method which is simple in construction and easy to operate.

According to the invention the problem involved is solved in that a heatdissipation, corresponding to the image of the original, is produced inan areal heat storage body, and that this heat dissipation and anintermediate substance reacting to heat is brought into contactingpressure engagement with a sheet, preferably of paper, whereby thissubstance will react in accordance with the heat dissipation and producein the zones of reaction an image on the sheet of paper.

By using the heat method for producing a selective heat dissipation theinvention provides an indirect heat dissipation causing no reaction whengenerated, but is used to produce an image on a normal copying sheet,preferably made of paper.

If the copy material and an original are superposed in areal engagement,zones of increased temperature may be produced, for example by directinga heat radiation by means of an infrared radiator through the copymaterial, which radiation is absorbed in the black zones of the originaland converted into heat. This is known.

Preferably the heat reactive substance is a meltable powder which,according to an advantageous embodiment of the invention, ischaracterized in that no foreign particles besides the pigment particlesare required. In this connection it should be noted however that theinvention also includes the use of a powder including, or consisting ofa dyestuff, for example a meltable artificial resin on the base ofpolystyrol, and if required with an addition of nigrosine.

According to another embodiment of the invention a first heat reactivesubstance is used which, upon heating, will react with a secondsubstance applied to the receiving sheet. This second substance may beprovided on the receiving sheet, or, for example, may also be avolatilizing substance which, before the powder is applied, is appliedto or sprayed on the receiving sheet, whereby the advantage of using anormal sheet of paper is maintained.

An advantageous embodiment of the invention provides that the heatstorage body is cooled before inducing the heat dissipation.

According to a preferred embodiment of the invention an original isbrought into surface contacting engagement with the heat storage bodyand is exposed during the contacting period to a source of radiation,whereupon the heat storage body is moved towards a contact pressureelement, while simultaneously the original is removed from the heatstorage body, the heat reactive substance is applied between the heatstorage body and the receiving sheet, and this sheet is passed throughthe contact pressure element, whereby the reaction of the heat reactivesubstance according to the heat dissipation is accomplished.

The device according to the invention for dry copying image from anoriginal on a copy sheet comprises within a common housing heat storagemeans, cooling means selectively acting upon said heat storage means, asource of radiation controlled to act upon said heat storage meanssubsequently to the action of said cooling means, first contact pressuremeans arranged with respect to said source of radiation in such a mannerthat a sheet-like original fed to said first contact pressure means ispressed against said heat storage means in that zone in which saidsource of radiation is effective, second contact pressure means arrangedto press a sheet against said heat storage means, and means for feedinga heat reactive substance to said sheet pressed by said second contactpressure means against said heat storage means.

It is to be noted that the copying device according to one embodiment ofthe invention merely requires a single contact pressure element if, forexample, a platelike heat storage body, corresponding to the size of theoriginal, is used, above which a corresponding contact pressure plate isarranged. In this the original may be placed on the heat storage plateand urged against it, during which period the source of radiation isswitched on. After releasing the contact pressure plate the original isexchanged against a receiving sheet, preferably a sheet of paper, aftereither the heat storage plate, or that side of the sheet facing the heatstorage plate has been covered with heat reactive substance or pigmentpowder. Thereupon the contact pressure plate is urged a second timeagainst the arrangement, whereby the heat reactive substance or pigmentpowder is reacting in the increasedly heated Zones of the heat storageplate, so that, for example by melting the heat reactive substance andadhering to the sheet, the copy of the image of the original isproduced.

Preferably the device according to the invention comprises a hollowcylindrical body forming said heat storage means, means rotatablysupporting said heat storage means within said housing, said first andsaid second contact pressure means being formed by a first and a secondroller, means rotatably supporting said first and said second rollerwithin said housing in contacting, rotating engagement with said heatstorage means, means for driving at least one of said rollerstransmitting its rotation by said contacting engagement to said heatstorage means which in turn is transmitting the rotation to the otherroller, said radiation source being arranged within said heat storagemeans located opposite the engagement zone of said first roller, thearrangement around said heat storage means being such that in thedirection of rotation first said cooling means become efi'ective, thensaid first roller and said source of radiation, then said means forfeeding said heat reactive substance, and finally said second roller.

According to the invention the storage drum is made of a material havinga low heat conductivity and a high high heat storage characteristic anda surface which is rejecting the heat reactive substance.

An especially advantageous feature of the invention must be seen in thefact that only one slot is required for introducing and dispensing theoriginal into and out of the device. In this the inlet slots for thereceiving sheet and the original are arranged one above the other, andthe guide path for the original is extending around the first contactpressure roller joining the inlet portion again.

According to the invention a supply container for the heat reactivesubstance, preferably a dyestutf, may be arranged above the nip betweenthe heat storage drum and the second contact pressure roller for thereceiving sheet Opening between the guide channel for this sheet and theheat storage drum. This opening may be provided with closing meansoperable in dependence on the passage of a sheet, preferably by thesheet itself. The closing means may, for example, be formed by a flapcontrolled by an abutment lever effecting the closing or opening of theoutlet fiap of the container. Preferably the outlet flap is acted uponby spring means, and is formed itself with an abutment extending intothe guide channel for the receiving sheet, the flap being disposed belowa partition wall between the container and the guide channel, which wallis forming an abutment for the outlet flap. Preferably the outlet flapis provided with dispersion openings which are closed when the flapabuts the partition wall.

According to the invention paper or cardboard as well as artificialresin or glass may be used for making the heat storage drum. It isimportant that the heat storage drum has a surface which has a low heatconductivity but a high heat storage capacity.

Additional means may be provided, comprising a stripping deviceconstantly effecting a cleaning action of the rotating heat storagedrum. This stripping device may be formed by a scraper or a brush.

Further features and advantages will become apparent as the descriptionof several embodiments of the subject matter of this invention,illustrated in the accompanying drawings proceeds, it being understood,however, that the embodiments are described by way of example only,since alterations are possible for those skilled in the art, withoutdeparting from the scope of the invention.

In the drawings:

FIG. 1 is a. partial sectional side view illustrating how the heatdissipation is induced;

FIG. 2 is a partial sectional side view of the heat storage means with areceiving sheet illustrating the method of copying an image;

FIG. 3 is a sectional side view of a preferred embodiment of the deviceaccording to the invention;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3;

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FIG. 5 is a sectional top view of the left hand cham- FIG. 6 is adiagrammatic view of the drive arrangement for the various elements ofthe device shown in FIGS. 3, 4, and 5;

FIG. 7 is a detail top view of the container closing flap according toFIG. 3;

FIG. 8 is an enlarged partial sectional side view of the closing flapaccording to FIG. 7 including the pivotal arrangement and the abutmentmeans for actuating the flap.

Now referring to the drawings it will be seen in FIGS. 1 and 2 that theheat storage element is generally denominated with the referencenumeral 1. FIG. 1 shows an original 2 placed on the heat storage element1 in such a way that the image, parts of which being denominated withthe reference numeral 3, is facing the heat storage element 1. On thatside of the heat storage element disposed remote of the original 2 asource of radiation 4, for example a heat radiator, or an infraredradiator, is provided, arranged within a reflector 5 serving to directthe rays to the heat storage element 1. The rays pass the heat storageelement 1. The colored areas 3 of the original 2 will absorb the raysand convert them into heat, whereby corresponding strongly heated zones6 are induced below the colored areas 3 of the original 2. Since theheat storage element has practically no, or merely a very low heatconductivity, the heat concentration at the zones 6 is maintained atleast during a limited period of time sufiicient to carry through themethod.

After the original has been removed a receiw'ng sheet 7 is placed on theheat storage element 1 with a heat reactive substance, followinglycalled pigment powder 8, disposed between the receiving sheet 7 and theheat storage element 1. The receiving sheet 7 is urged against the heatstorage element, as illustrated by the arrows 9 in FIG. 12. By means ofthis the pigment powder 8 is strongly heated over the heated zones 6 tosuch an extent that the pigment powder 8 will melt or dissolve in thezones and adhere to the facing side of the receiving sheet, whereby animage coresponding to the heated zones 6 is produced.

After the receiving sheet 7 is removed from the heat storage element 1the molten pigment powder 8 adheres to the receiving sheet 7 in theareas 10, while outside of these areas the pigment powder 8 may beshaken oil, or may be removed in any other suitable manner.

The illustration in FIGS. 1 and 2 are extremely enlarged, since thereceiving sheet 7 is practically a common sheet of paper.

FIG. 3 shows an advantageous device for making copies in theaforedescribed maner.

Within a housing 45 the heat storage element 1, which is formed by acylindrical drum, is arranged. This drum is journalled within thehousing 45, in a manner to be described yet, to rotate in the directionindicated by the arrow 11. The drum may, for example, be rotatablyjournalled between a first contact pressure roller 12 for the original2, a second contact pressure roller 13 for the receiving sheet 7, andguide rollers 14 which latter are arranged in the extended anglebisector of the angle included between lines passing through the centerof the drum 15 and the axis of the first and the second contact pressureroller 12 and 13. The guide rollers 14 are disposed one at each end ofthe drum 15 outside of the working surface for making copies, i.e. inthe illustration according to FIG. 3 behind lateral partition walls eachhaving an opening through which the drum extends. The guide rollers 14may be journalled in the housing unyieldingly, since the contactpressure rollers 12 and 13 are preferably resiliently urged towards thecenter of the heat storage drum 15. For this purpose the shafts 16, 17of the contact pressure rollers 12, 13 may, for example, be journalledin bearing blocks 13, 19 having parallel side surfaces guided in slots20, 21 of the housing walls. These bearing blocks 18, 19 are acted uponby pre-tensioned springs 22, 23 urging them into contacting engagementagainst the heat storage drum 15.

The contact pressure rollers 12 and 13 may, for example, be made ofplastic material, rubber, or the like material, which is somewhatelastic. The rollers are rotating synchronously, i.e. with equalcircumferential speed, in a direction indicated by the arrows 24 and 25,and may be driven, except an embodiment is preferred, in which they aretaken along in dependence on the rotation of a driven heat storage drum15.

Inside of the heat storage drum the source of radiation 4 is disposedwithin the reflector 5 opposite the first contact pressure roller 12.

At the top of the housing 45 two inlet slots 26 and 27 are provided oneabove the other, the upper one serving for the introduction of thereceiving sheet 7 and the lower one for the original. The subsequentguide channed section 28 for the original bifurcates at the guideelement 29. The channel extending in the direction of the arrow 30 isdefined by the guide element 31 and the first contact pressure roller12, and leads to the heat storage drum 15, and thence between the roller12 and a guide element 32 concentrically encompassing the roller 12 backto the channel section 28. The guide element 32 simultaneously forms thepartition wall between the inlet slots 26, 27, a projection being formedbehind the lower inlet slot 27 for the original preventing an original,when introduced, to be moved above the guide element 29.

From the inlet slot 26 a guide channel for the receiving sheet 7,defined by the outer housing wall 34 and the guide element 32, extendsand terminates approximately above the nip between the second contactpressure roller 13 and the heat storage drum 15. This channel is definednel 35 and which is adapted to be opened.

Below the contacting zone between the drum 15 and the second contactpressure roller 13 a guide element is arranged which extends from thesecond contact pressure roller, from which its end is spaced a little,around the lower part of the heat storage dnrm 15 to the lower edge ofan outlet slot 41 provided in the housing wall. The guide element 41 isperforated over the section 42, or is formed grate-like, or providedwith slots, whereby pigment powder dropping down from the nip betweenthe .heat storage drum 15 and the second contact pressure roller 13 maybe gathered in a container 43 which is resting on the bottom plate 44 ofthe housing 45 and may, for example, be removed through a slot in one ofthe side walls. 1

Another container 46 is removably arranged on the bottom plate 44. Thiscontainer is disposed below a stripper 47, which may be formed by aresilient strip or brush resiliently engaging the outer circumference ofthe heat storage drum 15. Any pigment powder adhering to the heatstorage drum 15 will be removed by this stripper 47. T he guide element40 is also perforated or slotted in the Zone 48 with a wire-like gratingso that the removed p-igment powder may drop into the container 46.

The stripper 47 may, for example, be arranged adjacent the upper edge ofthe outlet slot 41 forming a partition wall 49. Spaced from thispartition wall 49 there is a second partition wall 56 provided which,together with the section 51 of the outer housing wall forms a coolingchamber 52, within which a low temperature is maintained, for example bydirecting a stream of cool air into 67 and 67a.

6 it, thereby cooling the surface of the heat storage drum 1 to an even,low temperature.

FIG. 4 shows that the operating chamber in the middle of the deviceshown in FIG. 3 in a sectional view which is defined by lateralpartition walls 53 and 54 forming outer lateral chambers 55 and 56serving to accommodate bearings and drive elements. The heat storagedrum 15 extends for example through apertures in the partition walls 53and 54 and is supported at its lower section by the guide rollers 14 and14a, the shafts of which being journalled on one side in the partitionwall 53 and the side wall 59, and on the other side in the partitionwall 54 and the side wall 60.

As shown in the upper part of FIG. 4 the first contact pressure roller12 is also extended into the lateral chambers 55 and 56 its shaft 16being journalled in the slots 20, or 20a respectively, of the side walls59, 60 of the housing 45, the springs 22 and 22a being provided betweenthe top wall of the housing 45 and bearing blocks The second contactpressure roller 13 is journalled correspondingly.

The drive is shown by way of example in FIG. 5, in which the heatstorage drum 15 is not illustrated, but merely the guide roller 14 andthe drive motor 62. It will be noted that the partition wall hasapertures 63 formed therein (see FIG. 3 also) which are covered bybafile surfaces 64 serving to direct a stream of cold air passingthrough the aperture to the heat storage drum 15. The apertures 63 areinterconnected by a manifold 65 arranged within the lateral chamber. Aventilator 66 is discharging into the manifold 65. The intake 67 of theventilator 66 may, for example, be extended outwardly through the sidewall 59 of the housing 45. The ventilator 66 is driven by the motor 62,for example via a transmission 68. The drive motor 62 drives the shaft57 of the guide roller 14 via a corresponding transmission with adifferent drive ratio. This shaft 57, for example, may be formedintegrally with the shaft of the guide roller 14a, provided it extendsabove the partition wall 49,whereby in this manner the drive of the heatstorage drum 15 may be accomplished.

It is understood that electrical connection means such as transformers,rectifiers, and the like for the radiator 4 may be arranged within thelateral chamber 56, or also in the lateral chamber 55. The radiator 4 isalso mounted on the partition walls 53 and 54, which are also serving tosupport the reflector 5.

The arrangement of the drive is shown in FIG. 6. The drive motor 62 hasa shaft 69 which may, for example, carry several pulleys for achievingdilferent drive ratios. The transmission 68 drives the ventilator 66,another transmission 70 drives the pulley 71 on a shaft. The pulleys '72and 73 are mounted on the shafts 17 and 16, and are driven by endlesshelical springs or so called garter springs. These drives are elastic,thereby preventing influence of the pressure action of the contactpressure rollers 12, 13.

One example of an embodiment of the container closing flap 39 is shownin the FIGS. 7 and 8. The flap 39 may, for example, be supported bypivot pins 76 and 77 rotatably journalled in the partition walls 53 and54. Springs 78 and 79 are acting on the pivot pins 76 and 77, therebyurging the flap 39 against the guide surface 36. The lower edge of theguide surface 36 is shown, for example, in hatched lines in FIG. 7.

The portion of the flap 39 extending below the guide surface 36 isprovided with narrowly spaced slots 80 open towards the side of theguide channel. If the flap is pressed against the guide surface 36 theinner ends of the slots are closed with respect to the chamber 38. Ifthe flap is rotated clockwise, as viewed in FIG. 3, pigment powder cantrickle out of the chamber 38 through the slots 80 and fall into the nipformed between the heat storage drum 15 and the second contact pressureroller 13. In this the shape of the slots allows to control the amountof pigment powder dispensed out of the container 38.

With reference to FIG. 3 the device functions in the following manner:

The original is introduced through the slot 27 with the image facingdownwardly, and simultaneously a receiving sheet of paper is introducedthrough the slot 26. The length of the path from the slot 26 through theguide channel 35 to the contacting spot between the heat storage drum 15and the second contact pressure roller 13 is equal to the length of thepath, corresponding to the arrow 30, from the slot 27, past the firstcontact pressure roller 12 to the contacting spot between the heatstorage drum 15 and the second contact pressure roller 13. The source ofradiation 4 may, for example, be switched on in dependence on theintroduction of the sheets. When the original is passed between the heatstorage drum 15 and the first contact pressure roller 12 a local heatdissipation is introduced on the heat storage drum 15, as has beendescribed iii-connection with FIG. 1. In this the original and the heatstorage drum 15 continue rotating, and the original is returned to theslot 27, while the heat storage drum 15 with its heat dissipation ismoving towards the second contact pressure roller 13. The paper sheetintroduced through the slot 26 abuts with its leading edge projectionsformed on the flap 39 and extending across the mouth of the guidechannel 35, whereby the flap 39 is opened and pigment powder allowed totrickle out of the container 38 through the slots 80 of the flap 39 andfall into the nip formed between the heat storage drum 15 and the secondcontact pressure roller 13. The leading edge of the receiving sheet ofpaper simultaneously reaches the contacting line between that zone ofheat dissipation on the heat storage drum 15 which corresponds to theleading edge of the original. The pigment powder covering the heatedzones of the heat storage drum 15 is molten and absorbed by the surfaceof the paper sheet which, according to a preferred embodiment isabsorbing, whereby the copied image will be produced on this surface.The thus treated sheet of paper passes along the guide element. 40 andout of the outlet slot 41. Pigment powder which, due to the missing ofheated zones, has not been molten after the sheet of paper has passedthe second contact pressure roller 13 drops into the container 43. Ifpigment powder should adhere to the surface of the heat storage drum 15it is removed by the stripper 47 and drops into the container 46. Theheated zones are cooled when passing the chamber 52, whereby an evenlycooled surface reduced to a low temperature is obtained on the heatstorage drum 15, before this section of the surface reaches the zone ofradiation 4 again.

A certain absorbing capacity of the receiving sheet of paper is veryadvantageous in order to keep the smooth, and preferably hard, surfaceof the drum as clean as possible.

What is claimed:

1. In an apparatus for producing dry copies from an original on acopying sheet comprising, in combination, mounting means, a thermalimage-retaining transfer and heat storage cylinder rotatably supportedon said mounting means, said cylinder having an upper portion, heatradiating means mounted Within said cylinder, said radiating meansirradiating said cylinder upper portion, first roller pressing meansrotatably supported on said mounting means at a location outside of saidcylinder and in such a manner that said pressing means resilientlyengages said upper portion of said cylinder which is irradiated by saidheating radiating means, second roller pressing means rotatablysupported on said mounting means at a location outside of said cylinderspaced in the direction of rotation relative to said first pressingmeans and resiliently engaging said cylinder, a first feed channelhaving an inlet and an outlet, said outlet being adjacent said cylinderin the peripheral zone thereof between said first and said secondpressing means and extending toward said second pressing means, storagemeans defined within said mounting means intermediate said cylinder andsaid first channel outlet and having an outlet opening disposed adjacentthe outlet of said first channel and intermediate said first channeloutlet and said cylinder, closure means selectively opening and closingsaid storage means outlet opening, spring means biasing said closuremeans toward its closed position, actuating means defined on saidclosure means extending into the outlet of said first channel andoperable by a copying sheet being advanced through said first channel soas to open said closure means during the passage of said sheet, a secondfeed channel having an inlet for feeding an original intermediate saidfirst pressing means and said cylinder, and drive means driving saidcylinder.

2. In a device as in claim 1 wherein said first and said second pressingmeans engage said cylinder at locations spaced approximately on theperiphery of said cylinder.

3. In a device as in claim 1 wherein cooling means are mounted on saidmounting means associated with said cylinder at a location of itscircumference prior to said first pressing means relative to thedirection of cylinder rotation.

4. In a device as in claim 1 wherein the inlet of said second channel isadjacent the inlet of said first channel, said second channelencompassing said first pressing means in a loop-like manner whereby anoriginal introduced into said second channel is transported around saidfirst pressing means and is dispensed through the inlet of said secondchannel, the length of the path from the inlet of said second channel tothe zone of engagement between said first pressing means and saidcylinder and from this zone of engagement along the cylindercircumference to said second pressing means being substantially equal tothe length of the copying sheet path from the inlet of said firstchannel to the zone of engagement between said cylinder and said secondpressing means.

5. In a device as in claim 1 wherein an outlet opening is defined insaid mounting means, a guide element leading to said mounting meansoutlet opening and extending from said outlet opening around the lowerportion of the circumference of said cylinder in spaced relation theretoto below the zone of engagement between said cylinder and said secondpressing means, and perforations defined in said guide element.

References Cited in the file of this patent UNITED STATES PATENTS2,503,758 Murray Apr. 11, 1950 2,927,210 OMara Mar. 1, 1960 2,934,649Walkup Apr. 26, 1960 3,081,699 Gulko Mar. 19, 1963

1. IN AN APPARATUS FOR PRODUCING DRY COPIES FROM AN ORIGINAL ON ACOPYING SHEET COMPRISING, IN COMBINATION, MOUNTING MEANS, A THERMALIMAGE-RETAINING TRANSFER AND HEAT STORAGE CYLINDER ROTATABLY SUPPORTEDON SAID MOUNTING MEANS, SAID CYLINDER HAVING AN UPPER PORTION, HEATRADIATING MEANS MOUNTED WITHIN SAID CYLINDER, SAID RADIATING MEANSIRRADIATING SAID CYLINDER UPPER PORTION, FIRST ROLLER PRESSING MEANSROTATABLY SUPPORTED ON SAID MOUNT ING MEANS AT A LOCATION OUTSIDE OFSAID CYLINDER AND IN SUCH A MANNER THAT SAID PRESSING MEANS RESILIENTLYENGAGES SAID UPPER PORTION OF SAID CYLINDER WHICH IS IRRADIATED BY SAIDHEATING RADIATING MEANS, SECOND ROLLER PRESSING MEANS ROTATABLYSUPPORTED ON SAID MOUNTING MEANS AT A LOCATION OUTSIDE OF SAID CYLINDERSPACED IN THE DIRECTION OF ROTATION RELATIVE TO SAID FIRST PRESSINGMEANS AND RESILIENTLY ENGAGING SAID CYLINDER, A FIRST FEED CHANNELHAVING AN INLET AND AN OUTLET, SAID OUTLET BEING ADJACENT SAID CYLINDERIN THE PERIPHERAL ZONE THEREOF BETWEEN SAID FIRST AND SAID SECONDPRESSING MEANS AND EXTENDING TOWARD SAID SECOND PRESSING MEANS, STORAGEMEANS DEFINED WITHIN SAID MOUNTING MEANS INTERMEDIATE SAID CYLINDER ANDSAID FIRST CHANNEL OUTLET AND HAVING AN OUTLET OPENING DISPOSED ADJACENTTHE OUTLET OF SAID FIRST CHANNEL AND INTERMEDIATE SAID FIRST CHANNELOUTLET AND SAID CYLINDER, CLOSURE MEANS SELECTIVELY OPENING AND CLOSINGSAID STORAGE MEANS OUTLET OPENING, SPRING MEANS BIASING SAID CLOSUREMEANS TOWARD ITS CLOSED POSITION, ACTUATING MEANS DEFINED ON SAIDCLOSURE MEANS EXTENDING INTO THE OUTLET OF SAID FIRST CHANNEL ANDOPERABLE BY A COPYING SHEET BEING ADVANCED THROUGH SAID FIRST CHANNEL SOAS TO OPEN SAID CLOSURE MEANS DURING THE PASSAGE OF SAID SHEET, A SECONDFEED CHANNEL HAVING AN INLET FOR FEEDING AN ORIGINAL INTERMEDIATE SAIDFIRST PRESSING MEANS AND SAID CYLINDER, AND DRIVE MEANS DRIVING SAIDCYLINDER.